window["Water"] = function(){
	if (window["Water"]) {
	        return window["Water"];
	}
	var obj = {};
	obj.watermark = function(settings) {
	    //debugger;
	    //默认设置
	    var defaultSettings={
	        watermark_txt:"text",
	        watermark_x:20,//水印起始位置x轴坐标
	        watermark_y:20,//水印起始位置Y轴坐标
	        watermark_rows:10,//水印行数
	        watermark_cols:10,//水印列数
	        watermark_x_space:50,//水印x轴间隔
	        watermark_y_space:50,//水印y轴间隔
	        watermark_color:'#aaa',//水印字体颜色
	        watermark_alpha:0.5,//水印透明度
	        watermark_fontsize:'15px',//水印字体大小
	        watermark_font:'微软雅黑',//水印字体
	        watermark_width:250,//水印宽度
	        watermark_height:50,//水印长度
	        watermark_angle:35//水印倾斜度数
	    };
	    
		//采用配置项替换默认值，作用类似jquery.extend(读取传入的参数，获取对象中的值替换默认配置)
	    if(arguments.length===1&&typeof arguments[0] ==="object" )
	    {
	        var src=arguments[0]||{};
	        for(key in src)
	        {
	            if(src[key]&&defaultSettings[key]&&src[key]===defaultSettings[key])
	                continue;
	            else if(src[key])
	                defaultSettings[key]=src[key];
	        }
	    }
	
	    var oTemp = document.createDocumentFragment();//创建文档碎片节点
		
	    //获取页面最大宽度
	    var page_width = Math.max(document.body.scrollWidth,document.body.clientWidth);
	    var cutWidth = page_width*0.0150;
	    var page_width=page_width-cutWidth;
	    //获取页面最大高度
	    var page_height = Math.max(document.body.scrollHeight,document.body.clientHeight)+800;
	    
	    //如果将水印列数设置为0，或水印列数设置过大，超过页面最大宽度，则重新计算水印列数和水印x轴间隔
	    if (defaultSettings.watermark_cols == 0 || (parseInt(defaultSettings.watermark_x + defaultSettings.watermark_width *defaultSettings.watermark_cols + defaultSettings.watermark_x_space * (defaultSettings.watermark_cols - 1)) > page_width)) {
	        defaultSettings.watermark_cols = parseInt((page_width-defaultSettings.watermark_x+defaultSettings.watermark_x_space) / (defaultSettings.watermark_width + defaultSettings.watermark_x_space));
	        defaultSettings.watermark_x_space = parseInt((page_width - defaultSettings.watermark_x - defaultSettings.watermark_width * defaultSettings.watermark_cols) / (defaultSettings.watermark_cols - 1));
	    }
	    //如果将水印行数设置为0，或水印行数设置过大，超过页面最大长度，则重新计算水印行数和水印y轴间隔
	    if (defaultSettings.watermark_rows == 0 || (parseInt(defaultSettings.watermark_y + defaultSettings.watermark_height * defaultSettings.watermark_rows + defaultSettings.watermark_y_space * (defaultSettings.watermark_rows - 1)) > page_height)) {
	        defaultSettings.watermark_rows = parseInt((defaultSettings.watermark_y_space + page_height - defaultSettings.watermark_y) / (defaultSettings.watermark_height + defaultSettings.watermark_y_space));
	        defaultSettings.watermark_y_space = parseInt(((page_height - defaultSettings.watermark_y) - defaultSettings.watermark_height * defaultSettings.watermark_rows) / (defaultSettings.watermark_rows - 1));
	    }
	    var x;
	    var y;
	    for (var i = 0; i < defaultSettings.watermark_rows; i++) {
	        y = defaultSettings.watermark_y + (defaultSettings.watermark_y_space + defaultSettings.watermark_height) * i;
	        for (var j = 0; j < defaultSettings.watermark_cols; j++) {
	            x = defaultSettings.watermark_x + (defaultSettings.watermark_width + defaultSettings.watermark_x_space) * j;
	
	            var mask_div = document.createElement('div');
	            mask_div.id = 'mask_div' + i + j;
	            mask_div.className = 'mask_div';
	            mask_div.appendChild(document.createTextNode(defaultSettings.watermark_txt));
	            //设置水印div倾斜显示
	            mask_div.style.webkitTransform = "rotate(" + defaultSettings.watermark_angle + "deg)";
	            mask_div.style.MozTransform = "rotate(" + defaultSettings.watermark_angle + "deg)";
	            mask_div.style.msTransform = "rotate(" + defaultSettings.watermark_angle + "deg)";
	            mask_div.style.OTransform = "rotate(" + defaultSettings.watermark_angle + "deg)";
	            mask_div.style.transform = "rotate(" + defaultSettings.watermark_angle + "deg)";
	            mask_div.style.visibility = "";
	            mask_div.style.position = "absolute";
	            mask_div.style.left = x + 'px';
	            mask_div.style.top = y + 'px';
	            mask_div.style.overflow = "hidden";
	            mask_div.style.zIndex = "9999";
	            mask_div.style.pointerEvents='none';//pointer-events:none  让水印不遮挡页面的点击事件
	            mask_div.style.opacity = defaultSettings.watermark_alpha;
	            mask_div.style.fontSize = defaultSettings.watermark_fontsize;
	            mask_div.style.fontFamily = defaultSettings.watermark_font;
	            mask_div.style.color = defaultSettings.watermark_color;
	            mask_div.style.textAlign = "center";
	            mask_div.style.width = defaultSettings.watermark_width + 'px';
	            mask_div.style.height = defaultSettings.watermark_height + 'px';
	            mask_div.style.display = "block";
	            oTemp.appendChild(mask_div);
	        };
	    };
	    document.body.appendChild(oTemp);
	};
	return obj;
}();
